Study the image below and answer the question.

The following is the graph between potential energy between nucleons versus the separation between them. It is seen that the potential energy is a minimum at a distance r_o of about 0.8 fm.

What is the correct order of the nuclear forces between the following? n-n : neutron - neutron p-p : proton -proton n-p : neutron - proton

n-n=p-p=n-n

As these forces do not depend upon charge, they are same for all three pairs of nucleons.